Silicone Condensation 20 Resin – Mould Rubber for Polyurethane & Epoxy Casting
Silicone Condensation 20 Resin – Mould Rubber for Polyurethane & Epoxy Casting
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All technical specifications, safety information and data sheets remain available below.
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Variant: 1 kg A component + 50 grams T21 B component
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Premium Condensation Silicone for Professional Applications
Condensation Silicone 20 Shore A is a medium-hardness tin-cure mould rubber, specially developed for making durable moulds for polyurethane and epoxy casting. This liquid silicone combines excellent detail reproduction with high tensile strength, making it ideal for both prototyping and production work.
Key Benefits
- Excellent flow: captures the finest details and textures with ease
- High tensile strength: durable moulds that withstand intensive use
- Medium hardness (20 Shore A): optimum balance between flexibility and stability
- Compatible with PU and epoxy: no inhibition when used with polyurethane and epoxy systems
- Reliable curing: predictable working time and consistent results
- Cost-effective: excellent value for money for professional use
Typical Applications
- Moulds for polyurethane casting (PU foam, elastomers, rigid resins)
- Epoxy and acrylic resin casting (Acrylic One, concrete-look pieces, decorative objects)
- Prototyping and production work in design and engineering
- Props and set building for film, theatre and events
- Copying sculptures and ornaments for artists and restorers
- Jewellery and small-scale reproduction in the creative industries
Technical Characteristics
This condensation silicone is supplied as a two-component system and is easy to process at room temperature. Its medium hardness of 20 Shore A produces flexible moulds that are easy to demould, while the high tensile strength allows long-term use. Suitable for plaster, concrete, wax, polyurethane and epoxy.
Please note: Pot life (working time) and demoulding time depend strongly on the mix ratio and the humidity. Adding more silicone B (curing agent) or working at higher humidity shortens both the pot life and the demoulding time.
Brushing, Spreading or Trowelling
To brush, spread or trowel the silicone, you can add Thixo C (0.6–2%, typically 1%). This thickener makes the silicone spreadable with a spatula. With this method, the mould needs a support shell made of plaster bandage, epoxy support shell material, or acrylic resin with thickener and glass fibre fabric.
Produced by Silicones and More, specialists in high-quality mould rubbers and casting materials for professional makers.
Professional Support
Questions about working time, mix ratios or possible applications? Our technical team will be happy to advise you on the right material for your project.
Product Properties
- Hardness24Shore AHardness of the silicone material
- ColorWhiteColor of the finished product
- TransparencyOpaqueDegree of transparency
- Viscosity18000mPa·sViscosity of the uncured silicone
- Density1.08g/cm³Density of the cured material
- Mix ratio100:5Mixing ratio A : B
- Tensile strength3.92MPaMaximum tensile force before breaking
- Tear strength27.5kN/mResistance against tearing
- Elongation at break450%Maximum stretch before breaking
- Pot life120minutesWorking time after mixing
- Cure time2880minutesTime until full cure
Component Properties
- Color AwhiteColor of component A
- Color BcolorlessColor of component B
- Viscosity A18000mPa·sViscosity of component A
- Viscosity B15mPa·sViscosity of component B
Application
- Use caseMould making for polyurethane and epoxy castingIntended use
- Silicone type["Condensation curing","RTV-2"]Type of silicone or polymer
- Cure speedSlowHow quickly the material can be demoulded
Safety Information
Wear splash goggles, suitable liquid-tight gloves, an apron, and work in a well-ventilated area. See the Safety Data Sheet for more information.| Safety Pictograms | Safety Data Sheets (SDS) |
|---|---|
GHS hazard pictograms
Required protection (ISO 7010)
   |
| Signal Word | H‑code | Hazard Statement | P‑codes | P‑statements |
|---|---|---|---|---|
| Warning | H373 | May cause damage to organs through prolonged or repeated exposure | P260 P501 |
|
Frequently asked questions
What is the delivery time for my order?
Orders placed and paid on working days are in most cases shipped the same day. Weekend orders are processed on the next working day.
Indicative delivery times: Netherlands usually within 1 working day, Belgium and Germany typically 1–2 working days, other countries depending on destination and carrier. These are guidelines, not guarantees: peak periods, public holidays or carrier delays can have an effect.
What is the return policy?
You have 30 days to return after receipt. Email info@siliconesandmore.com within 30 days of delivery with your name and order number. The full conditions are in our return policy.
How can I track my order?
As soon as your order has shipped, you'll receive a track & trace code by email. It can take up to 24 hours before the code is active.
I have a problem with my order – how do I reach you?
Contact us via our contact page or email info@siliconesandmore.com. We're happy to help you quickly.
Can I order as a business?
Yes. Apply for a business account; we review your application within 3 working days. After that you order while logged in and pay on invoice, with payment terms of 14 days after delivery.
EU businesses outside the Netherlands with a valid VAT number order with VAT reverse-charged (0%, intra-community supply). The VAT number is stored in your business account; it cannot be added to an order after it has been placed.